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Our main catalog includes extended X-ray sources optically identified with galaxy clusters and with the X-ray flux above 1.4e−13 erg s−1 cm−2 (0.5–2 keV), 242 objects total. A few clusters are not in the main sample because they are associated with the ROSAT targets.
Several objects are legitimate extended X-ray sources but not clusters.
Finally, some of the X-ray detections do not have cluster counterparts; most likely, they are false detections (confused point sources).
Catalog data links: